When Values of K_a Are Small (E

question 11

Multiple Choice

When values of K_a are small (e.g., 1 *10^-5) and concentrations of weak acids [HA] are relatively large (e.g., 0.10 M) , the hydronium ion concentration of the solution can be calculated using which expression?

• A) [H⁺] = K_a
• B) [H⁺] = K_a[HA]
• C) [H⁺] = (K_a[HA])^1/2
• D) [H⁺] = K_aK_b[HA]
• E) [H⁺] = K_a[HA]/[A^-]

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